He's still young and kids that age really love their parent's room. However, parents tend to like to sleep! Some parents just lay a small mattress on the floor and tell their small children they can come in the room but only to sleep on that mattress and only if they don't disturb the parents by talking or making noise. If you prefer not to have him in your room at all, then just be prepared for a few noisy nights while you train him to go back to his room. If you have no ambivalence about this, he'll eventually go. But if there is any chance you would change your mind, then don't even start this - just let him come in your room right away. If you are serious about having him in his own room, you can tell him that he has to go back to bed and if he wakes up the baby in that process there will be a punishment for him in the morning (for instance, if he can normally play or watch T.V. or have a sweet cereal, any of these privileges can be removed, or think of another punishment that he really won't like). Since the punishment happens several hours after the "crime" you can expect the learning process to take 3-5 days. Do NOT give up. If it's your rule, then it's your rule. Make sure to remain calm even if your child doesn't. If he isn't with the program after 5 days, try a harsher punishment. Again, refrain from all signs of anger; let the punishment do the teaching. Another route you can try if you prefer, is to tell him that if he makes noise when you put him back to bed, then he'll have to be taken down to the basement until he is quiet. Don't lock him there - you're not trying to terrorize him. Just tell him he has to sit on the basement stairs until he is ready to be quiet. This has the advantage of being a quicker learning technique and also stops the baby from being disturbed. So there's some starter ideas. If they don't work, then do make an appointment with a child specialist and see what else you can work out.   Sarah Chana